Oil-gas multiphase pump

Abstract

The utility model belongs to the technical field of oil-gas mixed transportation, and provides an oil-gas mixed transportation pump which is provided with a water inlet end and a water outlet end which are oppositely arranged in the axial direction of the oil-gas mixed transportation pump and comprises a pump shaft and a shell. In particular a pump shaft; the pump shaft is sleeved with the shell, and a containing space is formed between the shell and the pump shaft; a containing space is formed in the shell, a transition assembly, an axial flow assembly and a centrifugal assembly are arranged in the containing space of the shell, the transition assembly is connected between the axial flow assembly and the centrifugal assembly, the transition assembly is fixedly connected with the shell, the axial flow assembly is arranged close to the water inlet end, and the centrifugal assembly is arranged close to the water outlet end. The oil-gas multiphase pump aims to solve the technical problems of supercharging capacity and working condition range of the oil-gas multiphase pump in the prior art. The effects of being compact in structure, saving space and cost and effectively reducing the failure rate are achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of oil-gas mixed transportation, and particularly refers to an oil-gas mixed transportation pump. Background Art

[0002] In the process of oilfield exploitation, oil, gas, water and other impurities coexist at the wellhead. To transport this mixture, the traditional way of gas-liquid two-phase transmission is to separate the liquid phase from the gas phase and then transport them separately with pumps and compressors. This requires the installation of gas-liquid separation devices, pumps, compressor units and two pipelines at each wellhead. This configuration has high construction costs and high management costs during operation. As a new technology, the new oil-gas mixed transmission system only needs one unit and one pipeline at each wellhead. Compared with the traditional gas-liquid two-phase transmission system, it has the advantages of simple structure, convenient operation, easy control, low investment, etc., and has broad application prospects.

[0003] The oil-gas mixed flow pump is the most critical core equipment for realizing the advanced process of gas-liquid mixed flow. It has the dual characteristics of a pump and a compressor, represents the international advanced level and development trend, has extremely high technical content and great difficulty, and is a common problem faced by the world's pump industry. At present, the oil-gas mixed flow pump, which is more studied, can be divided into rotary power multiphase pump and volumetric multiphase pump according to the working principle. The former includes multi-stage axial flow mixed flow pump, multi-stage centrifugal mixed flow pump, etc., and the latter includes twin-screw pump, diaphragm pump, linear piston pump and rotor multiphase pump, etc.

[0004] The current multi-stage axial flow mixed pump is characterized by a wide gas-liquid ratio range and high efficiency, and is suitable for large flow, medium and low head conditions. However, when a higher head is required, too many stages will cause the pump shaft to be too long, which is prone to disturbance and noise, causing equipment instability; while the multi-stage centrifugal mixed pump is characterized by a small flow, high head, and a small gas-liquid ratio range. When the gas-liquid ratio is high, the blades are easily damaged, and the whole machine is prone to failure, affecting its life. That is, neither the multi-stage axial flow mixed pump nor the multi-stage centrifugal mixed pump is suitable for conditions with a large gas-liquid ratio range and high head. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide an oil-gas mixed flow pump to solve the technical problem that the prior art oil-gas mixed flow pump cannot meet the special working conditions of a large gas-liquid ratio range and high head.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide an oil-gas mixed flow pump, which has an inlet end and an outlet end relatively arranged along its axial direction, and includes a pump shaft and a housing; specifically, a pump shaft; a housing, which is sleeved on the outside of the pump shaft and forms a accommodating space with the pump shaft; a transition component, an axial flow component and a centrifugal component are arranged in the accommodating space of the housing, the transition component is connected between the axial flow component and the centrifugal component, the transition component is fixedly connected to the housing, the axial flow component is arranged close to the water inlet end, and the centrifugal component is arranged close to the water outlet end.

[0007] The technical solution provided by the present embodiment has the following beneficial effects compared with the prior art: the oil-gas mixed flow pump provided in the present embodiment, after the oil-gas mixture with a wide gas-liquid ratio range passes through the axial flow component, transition component and centrifugal component in the pump body, it is fully mixed after multi-stage pressurization, and its gas content can be reduced to meet the subsequent inlet requirements, and after passing through multiple centrifugal components, the head can be rapidly increased, thereby meeting the special working conditions of a wide gas-liquid ratio range and high head; at the same time, the oil-gas mixed flow pump in the present embodiment has a compact structure, saves space and cost, and can effectively reduce the failure rate.

[0008] In one embodiment provided by the present application, the axial flow component includes at least two axial flow impellers sleeved on the pump shaft and an axial flow guide vane fixedly connected to the housing, and each of the axial flow impellers and each of the axial flow guide vanes are alternately arranged in sequence along the direction from the water inlet end to the water outlet end; the centrifugal component includes at least two centrifugal impellers sleeved on the pump shaft and a centrifugal guide vane fixedly connected to the housing, and each of the centrifugal impellers and each of the centrifugal guide vanes are alternately arranged in sequence along the direction from the water inlet end to the water outlet end. In this way, through multiple axial flow impellers, axial flow guide vanes, centrifugal impellers and centrifugal guide vanes, when the gas-liquid mixture enters the housing from the water inlet end, after passing through multiple alternately arranged axial flow impellers and axial flow guide vanes, and after multi-stage pressurization, the gas and liquid are fully mixed, and the gas content can be reduced. After passing through multiple centrifugal impellers, the head can be rapidly increased, thereby meeting the special working conditions of a large gas-liquid ratio range and high head.

[0009] In one embodiment provided in the present application, the housing includes at least one axial flow housing connected to the axial flow guide vane and two centrifugal housings connected to the centrifugal guide vanes, and the axial flow housing and the centrifugal housing are both sleeved on the pump shaft; the two adjacent axial flow housings, the two adjacent centrifugal housings, and the axial flow housing and the centrifugal housing are all sealed and connected. In this way, it is not only convenient to assemble multiple axial flow housings and multiple centrifugal housings, but also convenient to repair and replace the axial flow components and centrifugal components in the housing when they are damaged, which can save maintenance costs.

[0010] In one embodiment provided in the present application, the housing further comprises a first transition shell connected to the transition assembly, thereby facilitating not only the assembly of a plurality of first transition shells but also the repair and replacement of the transition assembly in the housing when it is damaged, thus saving maintenance costs.

[0011] In one embodiment provided in the present application, the housing further includes a second transition housing and a friction ring, the second transition housing is provided with a guide plate arranged in the direction of the pump shaft, the transition assembly and the centrifugal guide vane are respectively arranged on both sides of the guide plate; the friction ring is arranged between the guide plate and the centrifugal impeller close to the guide plate, or the friction ring is arranged between the centrifugal guide vane and the centrifugal impeller, and there is a gap between the friction ring and the centrifugal impeller. In this way, by setting the housing into multiple structures that can be detached and installed, when there is loss in the structure, parts can be replaced at any time according to the damaged parts, saving equipment maintenance costs.

[0012] In one embodiment provided in the present application, the axial flow guide vane and the axial flow housing connected to the axial flow guide vane are integrally formed; the transition assembly and the first transition housing connected to the transition assembly are integrally formed; the centrifugal guide vane and the centrifugal housing connected to the centrifugal guide vane are integrally formed. Thus, through the integrally formed setting, on the one hand, the equipment is not easy to be damaged, and on the other hand, the assembly labor and cost can be greatly saved.

[0013] In one embodiment provided in the present application, the housing further includes a plurality of sleeves sleeved on the pump shaft; the plurality of sleeves are respectively arranged between two adjacent axial flow impellers, between two adjacent centrifugal impellers, and between an adjacent axial flow impeller and a centrifugal impeller, so as to achieve axial positioning of each component and control the spacing.

[0014] In one embodiment provided in the present application, the water inlet end of the oil-gas mixed pump comprises a water suction chamber, a first bearing, a fastening nut, and a first gland that is sequentially sleeved on the pump shaft, and the first gland is sealed and connected to the water suction chamber. In this way, a sealed connection between the water inlet end and the accommodation space in the housing is achieved.

[0015] In one embodiment provided in the present application, the water outlet of the oil-gas mixed pump comprises a water pressure chamber, a second bearing, a second gland and a sealing member which are sequentially sleeved on the pump shaft; the water pressure chamber is in sealed communication with the housing, the second gland is arranged on the second bearing, and the sealing member is used to seal the water pressure chamber. In this way, a sealed connection between the water outlet and the accommodation space in the housing is achieved.

[0016] In one embodiment provided in the present application, the oil-gas mixed pump further includes a fastening stud, which is arranged between the water suction chamber and the water pressure chamber, so as to strengthen the tight connection between the water inlet, the water outlet and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A three-dimensional diagram of the overall structure of an oil-gas mixed transport pump in an embodiment provided in the present application;

[0019] Figure 2 A cross-sectional schematic diagram of an oil-gas mixed transport pump in an embodiment provided in the present application;

[0020] Figure 3 for Figure 2 A magnified schematic diagram of the local structure.

[0021] Among them, the reference numerals in the figure are:

[0022] 100-water inlet end; 110-water absorption chamber; 120-first bearing; 130-fastening nut; 140-first gland;

[0023] 200-water outlet; 210-water pressure chamber; 220-second bearing; 230-second gland; 240-seal;

[0024] 300- pump shaft;

[0025] 400-housing; 410-transition assembly; 420-axial flow assembly; 421-axial flow impeller; 422-axial flow guide vane; 430-centrifugal assembly; 431-centrifugal impeller; 432-centrifugal guide vane; 440-axial flow housing; 450-centrifugal housing; 460-first transition housing; 470-second transition housing; 471-guide plate; 480-sleeve;

[0026] 500- Fastening studs. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In the process of oilfield exploitation, oil, gas, water and other impurities coexist at the wellhead. To transport this mixture, the traditional way of gas-liquid two-phase transmission is to separate the liquid phase from the gas phase and then transport them separately with pumps and compressors. This requires the installation of gas-liquid separation devices, pumps, compressor units and two pipelines at each wellhead. This configuration has high construction costs and high management costs during operation.

[0031] Reference Figure 1 and Figure 2 The present application provides an oil-gas mixed flow pump, which has an inlet end 100 and an outlet end 200 arranged opposite to each other along its axial direction, and the oil-gas mixed flow pump includes a pump shaft 300 and a housing 400; the housing 400 is sleeved on the outside of the pump shaft 300, and a receiving space is formed between the housing 400 and the pump shaft 300; a transition component 410, an axial flow component 420 and a centrifugal component 430 are arranged in the receiving space of the housing 400, the transition component 410 is connected between the axial flow component 420 and the centrifugal component 430, the transition component 410 is fixedly connected to the housing 400, the axial flow component 420 is arranged close to the inlet end 100, and the centrifugal component 430 is arranged close to the outlet end 200.

[0032] In oil production, the oil and gas mixed flow pump is used to ensure the production of oil wells and to achieve the closed transportation of oil and gas, improve the development efficiency and achieve the purpose of closed transportation of oil and gas. The oil and gas mixed flow pump is used in the gathering and transportation process, mainly transporting crude oil containing gas, water, sand, etc., to achieve centralized purification, separation and storage of crude oil. In addition, it can also reduce the wellhead pressure and increase the production of a single well or region. The oil and gas mixed flow pump is the most critical core equipment for realizing the advanced process of gas-liquid mixed flow. It has the dual characteristics of a pump and a compressor. It has extremely high technical content and great difficulty. It is a common problem faced by the world's pump industry. The oil and gas mixed flow pumps currently on the market can be divided into rotary power multiphase pumps and volumetric multiphase pumps according to their working principles. The former includes multi-stage axial flow mixed flow pumps, multi-stage centrifugal mixed flow pumps, etc., and the latter includes twin-screw pumps, diaphragm pumps, linear piston pumps and rotor multiphase pumps.

[0033] The water inlet end 100 refers to the oil-gas mixed transport input end of the oil-gas mixed transport pump.

[0034] The water outlet 200 refers to the output end of the oil-gas mixed transport pump. As can be seen from the figure, the oil-gas mixture in this embodiment is input from the water inlet 100 and output from the water outlet 200, which is a bottom-up flow pattern.

[0035] The pump shaft 300 refers to the central axis of the oil-gas mixed transmission pump.

[0036] The housing 400 is a workpiece that is sleeved on the pump shaft 300 to protect the internal structure of the oil-gas mixed pump. The material of the housing 400 can be iron, alloy, or other materials with greater hardness. The housing 400 is hollow inside, and after it is connected to the pump shaft 300, a accommodating space is formed between the housing 400 and the pump shaft 300.

[0037] The axial flow component 420 refers to a workpiece sleeved on the pump shaft 300 and arranged on the side close to the water inlet end 100. It is designed as an axial flow type, wherein the axial flow type is a fluid machine in the axial direction, which generates a radial pressure difference through the rotation of the blades, so that the fluid flows along the axial direction. Its main feature is that the pressure difference between the inlet and outlet of the fluid is small, but the flow rate is large, and power transmission is achieved through the design of the blades. The blades usually have a curved shape, which can increase the fluid function and thus improve efficiency.

[0038] The centrifugal assembly 430 is a workpiece sleeved on the pump shaft 300 and arranged on the side close to the water outlet 200. It is designed as a centrifugal type, wherein the centrifugal type increases energy under the action of inertia, leaves the impeller in the radial direction, and works by the centrifugal force generated. Its main characteristics are large pressure difference, but small flow rate.

[0039] The transition component 410 is fixedly connected to the shell 400 and is arranged between the axial flow component 420 and the centrifugal component 430. That is, the axial flow component 420 and the centrifugal component 430 are arranged on both sides of the transition component 410, and are used to connect the axial flow component 420 and the centrifugal component 430 to form a flow channel through which the gas-liquid mixture can flow. The oil-gas mixture passes through the end of the axial flow component 420 and is introduced into the centrifugal component 430 through the transition component 410.

[0040] The technical solution provided by this embodiment has the following beneficial effects compared with the prior art: the oil-gas mixed flow pump provided in this embodiment, after the oil-gas mixture with a wide gas-liquid ratio range passes through the axial flow component 420, the transition component 410 and the centrifugal component 430 in the pump body, it is fully mixed after multi-stage pressurization, and its gas content can be reduced to meet the subsequent inlet requirements, and after passing through multiple centrifugal components 430, the head can be rapidly increased, thereby meeting the special working conditions of a wide gas-liquid ratio range and high head; at the same time, the oil-gas mixed flow pump in this embodiment has a compact structure, saves space and cost, and can effectively reduce the failure rate.

[0041] Reference Figure 2 and Figure 3 In one embodiment provided by the present application, the axial flow component 420 includes at least two axial flow impellers 421 sleeved on the pump shaft and an axial flow guide vane 422 fixedly connected to the housing 400, and each axial flow impeller 421 and each axial flow guide vane 422 are alternately arranged in sequence from the water inlet end 100 to the water outlet end 200; the centrifugal component 430 includes at least two centrifugal impellers 431 sleeved on the pump shaft 300 and a centrifugal guide vane 432 fixedly connected to the housing 400, and each centrifugal impeller 431 and each centrifugal guide vane 432 are alternately arranged in sequence from the water inlet end 100 to the water outlet end 200.

[0042] The first direction X refers to the axial direction of the oil-gas mixed transmission pump.

[0043] The second direction Y refers to a horizontal direction perpendicular to the axial direction of the oil-gas mixed transmission pump, wherein the first direction X and the second direction Y are orthogonal to each other.

[0044] The axial flow impeller 421 refers to an axial flow workpiece sleeved on the pump shaft 300 and close to the water inlet end 100. The axial flow impeller 421 can move relative to the pump shaft 300 to facilitate replacement and increase or decrease of the number of axial flow impellers 421.

[0045] It should be noted that if the number of axial flow impellers 421 sleeved on the pump shaft 300 is greater than one, in the horizontal direction (second direction Y) perpendicular to the axial direction of the oil-gas mixed pump, each axial flow impeller 421 can be connected to the pump shaft 300 through a key (not shown in the figure) to achieve synchronous rotation.

[0046] The axial flow guide vane 422 refers to an axial flow workpiece fixed on the housing 400. The axial flow guide vane 422 receives the gas-liquid mixture from the axial flow impeller 421 and transports the gas-liquid mixture toward the water outlet 200.

[0047] It should be noted that, in the present embodiment, the axial flow component 420 includes at least two axial flow impellers 421 sleeved on the pump shaft and an axial flow guide vane 422 fixedly connected to the housing 400, and each axial flow impeller 421 and each axial flow guide vane 422 are arranged alternately in sequence. For example: the axial flow component 420 may include two axial flow impellers 421 and one axial flow guide vane 422, or may include three axial flow impellers 421 and two axial flow guide vanes 422, and so on. That is to say, in the present embodiment, the number of axial flow guide vanes 422 is one less than the number of axial flow impellers 421. Generally, along the axial direction (first direction X) of the oil-gas mixed pump, in the direction from the water inlet end 100 to the water outlet end 200 (the direction of the first direction X), the axial flow impeller 421 and the axial flow guide vane 422 are arranged alternately in sequence.

[0048] The centrifugal impeller 431 is a centrifugal workpiece sleeved on the pump shaft 300 and close to the water outlet 200. The centrifugal impeller 431 can move relative to the pump shaft 300 to facilitate replacement and increase or decrease of the number of centrifugal impellers 431.

[0049] It should be noted that if the number of centrifugal impellers 431 sleeved on the pump shaft 300 is greater than one, in the horizontal direction (second direction Y) perpendicular to the axial direction of the oil-gas mixed pump, each centrifugal impeller 431 can be connected to the pump shaft 300 through a key (not shown in the figure) to achieve synchronous rotation.

[0050] The centrifugal guide vane 432 refers to a centrifugal workpiece fixed on the housing 400. The centrifugal guide vane 432 receives the gas-liquid mixture from the centrifugal impeller 431 and transports the gas-liquid mixture toward the water outlet 200.

[0051] It should be noted that, in the present embodiment, the centrifugal assembly 430 includes at least two centrifugal impellers 431 sleeved on the pump shaft 300 and a centrifugal guide vane 432 fixedly connected to the housing 400, and each centrifugal impeller 431 and each centrifugal guide vane 432 are alternately arranged in sequence. For example, the centrifugal assembly 430 may include two centrifugal impellers 431 and one centrifugal guide vane 432, or may include three centrifugal impellers 431 and two centrifugal guide vanes 432, and so on. That is to say, in the present embodiment, the number of centrifugal guide vanes 432 is one less than the number of centrifugal impellers 431. Generally, along the axial direction (first direction X) of the oil-gas mixed pump, in the direction from the water inlet end 100 to the water outlet end 200 (the direction of the first direction X), the centrifugal impellers 431 and the centrifugal guide vanes 432 are alternately arranged in sequence.

[0052] In this embodiment, through multiple axial flow impellers 421, axial flow guide vanes 422, centrifugal impellers 431 and centrifugal guide vanes 432, when the gas-liquid mixture enters the housing 400 from the water inlet end 100, it will first pass through the axial flow assembly 420, that is, through multiple axial flow impellers 421 and axial flow guide vanes 422 arranged alternately, and after multi-stage pressurization, the gas and liquid are fully mixed, and the gas content can be reduced, and can be reduced to meet the subsequent inlet requirements of the centrifugal assembly 430. When the gas-liquid mixture is pressurized and mixed by multiple axial flow impellers 421 and axial flow guide vanes 422 arranged alternately near the water inlet end 100, and then passes through multiple centrifugal impellers 431, the head can be rapidly increased, thereby meeting the special working conditions of a large gas-liquid ratio range and high head.

[0053] In an embodiment provided in the present application, the shell 400 includes at least one axial flow casing 440 connected to the axial flow guide vane 422 and two centrifugal casings 450 connected to the centrifugal guide vanes 432, and the axial flow casing 440 and the centrifugal casing 450 are both sleeved on the pump shaft 300; the two adjacent axial flow casings 440, the two adjacent centrifugal casings 450, and the axial flow casing 440 and the centrifugal casing 450 are all sealed and connected.

[0054] The axial flow casing 440 refers to the portion of the casing 400 connected to the axial flow guide vanes 422 .

[0055] It should be noted that in the present embodiment, the number of the axial flow guide vanes 422 is greater than or equal to one, and the corresponding number of the axial flow housings 440 is also greater than or equal to one, that is, each axial flow housing 440 is connected to a corresponding axial flow guide vane 422 .

[0056] In some embodiments, two adjacent axial flow casings 440 are sealed and communicated with each other.

[0057] In some embodiments, a plurality of axial flow housings 440 are sequentially sleeved on the pump shaft 300 , and the axial flow housings 440 are sealed and connected to each other.

[0058] The centrifugal housing 450 refers to the portion of the housing 400 connected to the centrifugal guide vanes 432 .

[0059] It should be noted that in the present embodiment, the number of the centrifugal guide vanes 432 is greater than or equal to 1, and the corresponding number of the centrifugal housings 450 is also greater than or equal to 1, that is, each centrifugal housing 450 is connected to a corresponding centrifugal guide vane 432 .

[0060] In some embodiments, two adjacent centrifuge housings 450 are sealed and connected to each other.

[0061] In some embodiments, a plurality of centrifugal housings 450 are sequentially sleeved on the pump shaft 300 , and the centrifugal housings 450 are sealed and connected to each other.

[0062] It should be noted that the adjacent axial flow housings 440 and centrifugal housings 450 are sealed and communicated with each other.

[0063] In this embodiment, the shell 400 is arranged in sections, which not only facilitates the assembly of multiple axial flow shells 440 and multiple centrifugal shells 450, but also facilitates the repair and replacement of the axial flow components 420 and the centrifugal components 430 in the shell 400 when they are damaged, thereby saving maintenance costs.

[0064] In an embodiment provided in the present application, the housing 400 further includes a first transition shell 460 connected to the transition assembly 410 .

[0065] The first transition shell 460 refers to a portion of the housing 400 connected to the transition assembly 410 .

[0066] The first transition housing 460 and the axial flow housing 440 are in sealed communication with each other, and the first transition housing 460 and the centrifugal housing 450 are in sealed communication with each other.

[0067] In this embodiment, the shell 400 is arranged in sections, which not only facilitates the assembly of multiple first transition shells 460, but also facilitates the repair and replacement of the transition assembly 410 in the shell 400 when it is damaged, thereby saving maintenance costs.

[0068] Reference Figure 2 and him Figure 3 In an embodiment provided in the present application, the housing 400 further includes a second transition shell 470 and a friction ring. The second transition shell 470 is provided with a guide plate 471 arranged toward the pump shaft 300. The transition assembly 410 and the centrifugal guide vane 432 are respectively arranged on both sides of the guide plate 471. The friction ring is arranged between the guide plate 471 and the centrifugal impeller 431 close to the guide plate 471, or the friction ring is arranged between the centrifugal guide vane 432 and the centrifugal impeller 431, and there is a gap between the friction ring and the centrifugal impeller 431.

[0069] The second transition housing 470 refers to a portion of the housing 400 that connects the centrifugal housing 450 and the first transition housing 460 .

[0070] The second transition housing 470 and the centrifugal housing 450 are in sealed communication with each other, and the second transition housing 470 and the first transition housing 460 are also in sealed communication with each other.

[0071] The guide plate 471 refers to a plate disposed on the second transition housing 470 toward the pump shaft 300 (the second direction Y). The guide plate 471 separates the transition assembly 410 and the centrifugal guide vane 432 at the upper and lower sides along the first direction X.

[0072] The friction ring refers to a component used to reduce mutual wear. The friction ring can be set between the guide plate 471 and the centrifugal impeller 431 close to the guide plate 471. When the friction ring is damaged, it is not necessary to replace the guide plate 471 and the centrifugal impeller 431. Only the friction ring needs to be replaced, which saves equipment maintenance costs. The friction ring can also be set between the centrifugal guide vane 432 and the centrifugal impeller 431 to reduce the mutual friction between the centrifugal guide vane 432 and the centrifugal impeller 431, so as to save equipment maintenance costs.

[0073] It is worth mentioning that there is a gap between the friction ring and the centrifugal impeller 431 .

[0074] In this embodiment, by configuring the housing 400 to be a plurality of detachable and installable structures, when there is structural damage, components can be replaced at any time according to the damaged parts, thus saving equipment maintenance costs.

[0075] In one embodiment provided in the present application, the axial flow guide vane 422 and the axial flow housing 440 connected to the axial flow guide vane 422 are integrally formed; the transition assembly 410 and the first transition housing 460 connected to the transition assembly 410 are integrally formed; and the centrifugal guide vane 432 and the centrifugal housing 450 connected to the centrifugal guide vane 432 are integrally formed.

[0076] In this embodiment, the one-piece molding arrangement can reduce the risk of damage to the device and greatly save assembly labor and costs.

[0077] Reference Figure 3 In an embodiment provided in the present application, the housing 400 further includes a plurality of sleeves 480 sleeved on the pump shaft 300; the plurality of sleeves 480 are respectively arranged between two adjacent axial flow impellers 421, between two adjacent centrifugal impellers 431, and between adjacent axial flow impellers 421 and centrifugal impellers 431.

[0078] The shaft sleeve 480 refers to a workpiece that separates the components sleeved on the pump shaft 300. There may be multiple shaft sleeves 480, and the multiple shaft sleeves 480 are sleeved on the pump shaft 300 respectively. The shaft sleeve 480 may be arranged between two adjacent axial flow impellers 421, between adjacent axial flow impellers 421 and centrifugal impellers 431, or between two adjacent centrifugal impellers 431. The shaft sleeve 480 can shorten the dimensions of the axial flow impeller 421 and the centrifugal impeller 431 along the first direction X, which is not only convenient for processing, but also convenient for assembling the axial flow impeller 421 and the centrifugal impeller 431 on the pump shaft 300.

[0079] In some embodiments, the sleeve 480 can also be replaced by a rod that extends the size of the axial flow impeller 421 and the centrifugal impeller 431 in the first direction X, which can be used to achieve axial positioning between two adjacent axial flow impellers 421, between adjacent axial flow impellers 421 and centrifugal impellers 431, and between two adjacent centrifugal impellers 431.

[0080] In some embodiments, a shaft sleeve 480 is disposed between the front end of the axial flow component 420 (the end pointing away from the first direction X) and the water inlet end 100 to facilitate assembly between the water inlet end 100 and the pump shaft 300 .

[0081] In some embodiments, a sleeve 480 is disposed between the rear end (the end pointing in the first direction X) of the centrifugal assembly 430 and the water outlet end 200 to facilitate assembly between the water outlet end 200 and the pump shaft 300 .

[0082] The water inlet end 100 of the oil-gas mixed flow pump includes a water suction chamber 110, a first bearing 120, a fastening nut 130 and a first pressure cover 140 which is sequentially sleeved on the pump shaft and covers the outside of the fastening nut 130. The first pressure cover 140 is sealed and connected to the water suction chamber 110.

[0083] The water suction chamber 110 refers to the chamber where the oil-gas mixed pump contacts the external gas-liquid mixture. Generally, the water suction chamber 110 is configured as a pipeline, and the interior of the water suction chamber 110 is connected to the accommodation space in the housing 400. The gas-liquid mixture passes through the axial flow impeller 421, the axial flow guide vane 422, the centrifugal guide vane 432 and the centrifugal impeller 431 from the water suction chamber 110 to the water outlet 200. The water suction chamber 110 is rotatably connected to the pump shaft 300, and the position of the water suction chamber 110 can be adjusted according to the operation requirements.

[0084] The first bearing 120 refers to a workpiece that is sleeved on the pump shaft 300 and disposed inside the water absorption chamber 110 along the first direction, and is used to assist the water absorption chamber 110 in rotating relative to the pump shaft 300 to reduce relative friction between the two.

[0085] The fastening nut 130 is a component for fixing the position of the first bearing 120 .

[0086] The first gland 140 is a protective member disposed outside the fastening nut 130 to protect the portion of the water inlet end 100 exposed to the outside, and can also be used to limit the movement of the pump shaft 300 in the first direction X.

[0087] In this embodiment, the fixing nut 130, the first bearing 120 and the water absorption chamber 110 are respectively sleeved on the pump shaft 300, the fixing nut 130 is detachably connected to the pump shaft 300, the first pressure cover 140 is covered on the end of the water absorption chamber 110 away from the water outlet end 200, the first pressure cover 140 is pressed on the first bearing 120, and the first pressure cover 140 is sealed and connected to the water absorption chamber 110.

[0088] In one embodiment provided in the present application, the water outlet end 200 of the oil-gas mixed flow pump includes a water pressure chamber 210, a second bearing 220, a second pressure cover 230 and a seal 240 which are sequentially sleeved on the pump shaft 300; the water pressure chamber is sealed and connected to the housing, the second pressure cover is arranged on the second bearing, and the seal is used to seal the water pressure chamber.

[0089] The water pressure chamber 210 refers to the cavity that connects the oil-gas mixed delivery pump and the external device to output the liquid. Generally, the water pressure chamber 210 is configured as a pipeline, and the interior of the water pressure chamber 210 is connected to the accommodation space in the housing 400. The gas-liquid mixture passes through the axial flow impeller 421, the axial flow guide vane 422, the centrifugal guide vane 432 and the centrifugal impeller 431 from the water suction chamber 110 to the water pressure chamber 210. The water pressure chamber 210 is rotatably connected to the pump shaft 300, and the position of the water pressure chamber 210 can be adjusted according to the operation requirements.

[0090] The second bearing 220 refers to a workpiece that is sleeved on the pump shaft 300 and disposed inside the water pressure chamber 210 along the first direction, and is used to assist the water pressure chamber 210 in rotating relative to the pump shaft 300 to reduce relative friction between the two.

[0091] The second pressure cover 230 is a component used to fix the position of the second bearing 220 , and may also be used to limit the movement of the pump shaft 300 in the first direction X.

[0092] The sealing member 240 is a component disposed inside the second gland 230 and sealing the entire internal structure.

[0093] In this embodiment, the water pressure chamber 210, the second bearing 220, the second pressure cover 230 and the seal 240 are respectively sleeved on the pump shaft 300, the water pressure chamber 210 is sealed and connected with the housing 400, the second pressure cover 230 is pressed on the second bearing 220, and the seal 240 is used to seal the water pressure chamber 210.

[0094] In an embodiment provided in the present application, the oil-gas mixed transmission pump further includes a fastening stud 500 , and the fastening stud 500 is disposed between the water suction chamber 110 and the water pressure chamber 210 .

[0095] The fastening stud 500 refers to a component provided in the water absorption chamber 110 and the water pressure chamber 210 , and is used to strengthen the tight connection between the water inlet end 100 , the water outlet end 200 and the housing 400 .

[0096] In some embodiments, the number of the fastening studs 500 may be one or more, which is not specifically limited herein. If the number of the fastening studs 500 is more than one, each fastening stud 500 needs to be along the second direction Y, and the plurality of fastening studs 500 are distributed around the outer surface of the housing 400.

[0097] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An oil-gas mixed delivery pump, having an inlet end and an outlet end oppositely arranged along its axial direction, characterized in that: The oil-gas mixed transport pump comprises: Pump shaft; A housing, which is sleeved on the outside of the pump shaft and forms a containing space with the pump shaft; A transition component, an axial flow component and a centrifugal component are arranged in the accommodating space of the shell, the transition component is connected between the axial flow component and the centrifugal component, the transition component is fixedly connected to the shell, the axial flow component is arranged close to the water inlet end, and the centrifugal component is arranged close to the water outlet end.

2. The oil-gas mixed transport pump according to claim 1, characterized in that: The axial flow assembly at least comprises two axial flow impellers sleeved on the pump shaft and an axial flow guide vane fixedly connected to the housing, and each of the axial flow impellers and each of the axial flow guide vanes are alternately arranged in sequence along the direction from the water inlet end to the water outlet end; The centrifugal assembly comprises at least two centrifugal impellers sleeved on the pump shaft and a centrifugal guide vane fixedly connected to the housing, and the centrifugal impellers and the centrifugal guide vanes are alternately arranged in sequence from the water inlet end to the water outlet end.

3. The oil-gas mixed transport pump according to claim 2, characterized in that: The housing at least comprises an axial flow housing connected to the axial flow guide vane and two centrifugal housings connected to the centrifugal guide vanes, and the axial flow housing and the centrifugal housing are both sleeved on the pump shaft; Two adjacent axial flow casings, two adjacent centrifugal casings, and the axial flow casing and the centrifugal casing are all in sealed communication.

4. The oil-gas mixed transport pump according to claim 3, characterized in that: The housing also includes a first transition shell connected to the transition assembly.

5. The oil-gas mixed transport pump according to claim 2, characterized in that: The housing further comprises a second transition housing and a friction ring, the second transition housing is provided with a guide plate arranged in the direction of the pump shaft, the transition assembly and the centrifugal guide vane are respectively arranged on both sides of the guide plate; The friction ring is arranged between the guide plate and the centrifugal impeller close to the guide plate, or the friction ring is arranged between the centrifugal guide vane and the centrifugal impeller, and there is a gap between the friction ring and the centrifugal impeller.

6. The oil-gas mixed transport pump according to claim 4, characterized in that: The axial flow guide vane and the axial flow housing connected to the axial flow guide vane are integrally formed; The transition assembly and the first transition housing connected to the transition assembly are integrally formed; The centrifugal guide vane and the centrifugal housing connected to the centrifugal guide vane are integrally formed.

7. The oil-gas mixed transport pump according to claim 4, characterized in that: The housing also includes a plurality of shaft sleeves sleeved on the pump shaft; The shaft sleeve is provided between two adjacent axial flow impellers, between two adjacent centrifugal impellers, and between an adjacent axial flow impeller and a centrifugal impeller.

8. The oil-gas mixed transport pump according to any one of claims 1 to 7, characterized in that: The water inlet end of the oil-gas mixed transmission pump includes a water suction chamber, a first bearing, a fastening nut and a first pressure cover which are sequentially sleeved on the pump shaft and cover the outside of the fastening nut, and the first pressure cover is sealed and connected to the water suction chamber.

9. The oil-gas mixed transport pump according to claim 8, characterized in that: The water outlet end of the oil-gas mixed flow pump includes a water pressure chamber, a second bearing, a second pressure cover and a sealing member which are sequentially sleeved on the pump shaft. The water pressure chamber is sealed and connected to the housing. The second pressure cover is arranged on the second bearing. The sealing member is used to seal the water pressure chamber.

10. The oil-gas mixed transport pump according to claim 9, characterized in that: The oil-gas mixed transmission pump also includes a fastening stud, and the fastening stud is arranged between the water suction chamber and the water pressure chamber.

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